TRACHYCARCINUS CORALLINUS. iT 
flagellum (which is about as long as the two distal segments of the peduncle 
taken together, and composed of about fifteen segments) is nearly naked. 
The chelipeds are very unequal in size on the two sides of the body in the 
male sex. In four specimens the right is the larger, in two the left. In 
adult specimens the large claw is naked, smooth, and ivory-white, like the 
tubercles of the carapace ; the merus has a few small teeth along its upper 
margin, most of them near the two ends of the segment, and there are also 
a few still smaller teeth along the postero-inferior margin; the carpus is 
inflated, its upper margin armed with one strong tooth and denticulated 
along its whole length; the propodus is short and somewhat swollen, the 
finger bent down at an obtuse angle with the lower border of the palm ; 
there are in most specimens two or three small tubercles or teeth on the 
superior margin of the propodus, besides a tubercular process at the articu- 
lation of the carpus; the dactylus is strong, down-curved, and furnished with 
small tubercles on its upper border ; both fingers are armed with large blunt 
teeth on their opposed edges. The smaller chela is furnished with sete ; it 
is slenderer than the large claw, and has proportionally longer fingers ; it is 
also sparsely granulated. In the female both chelipeds are of approximately 
equal size, and they resemble, both in size and shape, the smaller cheliped of 
the male. 
The ambulatory appendages are unarmed and clothed with coarse sete, 
which are most thickly set upon the dactyli. The dactyli are considerably 
longer than the propodi, nearly cylindrical, very straight, and tipped with a 
small, acute, horny nail. 
Dimensions of largest specimen (male): length of carapace, 26 mm. ; 
breadth of carapace, 27 mm.; length of larger cheliped, 50 mm.; propo- 
dus, 20 mm.; breadth of propodus, 10.5 mm.; length of smaller cheliped, 
24 mm.; propodus, 9 mm.; breadth of propodus, 4 mm.; length of first 
ambulatory leg, 55 mm. 
The carapace of the smallest ovigerous female measures 22X25 mm. 
The eggs are spherical and large for the size of the animal; they vary in 
size from one and a third to one and a half millimeters in diameter. About 
one hundred are laid by one female. 
The depth at which this animal lives is very great for a Brachyuran. I 
believe that the only species previously known that normally live below the 
500 fathom line are certain species of thusa and Aithusina, and Geryon 
quinguedens Smith. 
